Looks like I'm also having trouble when restoring from screen-saver phase...
If I start playing music, then let windows kill the monitor output so that I only have the HDMI input signal in the top left of my TV, then try to restore screen by pressing remote button (or mouse / keyboard) the screen will restore, but the program freezes. To the point where I need to restart the PC because nothing will cause any action at all (including CTRL ALT DEL).
Likewise if the HTPC is on but not the TV, if I press say, Watch TV on my remote, the screen will turn on but it will show the previous screen I was on before turning the screen off, and freeze as above.
